USN-4625-1: Firefox vulnerability

10 November 2020

Firefox could be made to crash or run programs as your login if it opened a malicious website.



  • firefox - Mozilla Open Source web browser


A use-after-free was discovered in Firefox. If a user were tricked in
to opening a specially crafted website, an attacker could exploit this
to execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

After a standard system update you need to restart Firefox to make
all the necessary changes.


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